Great Wall Owner's Forum - 4x4 and 4x2 Vehicles

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I was wondering whether anyone has experienced this with the v240. My vehicle only has 4300km on the clock, the engine has a slight misfire while idling and a jerk, stutter and hesitation when accelerating and after gear changes. I've played around with the plug gaps from 0.8 up to 1.1 (at 1.1 the engine "pings" alot on low revs) but it does not seem to make a difference. Could it be the plugs themselfs? The vehicle is fitted with a "TORCH" brand spark plug from the factory. Here in SA this an unfamilliar brand. I fill up with 93 octane unleaded petrol when in Johannesburg and 95 when down by the coast.Herman

My X240 has been known to jerk around a bit also. Just seems to have a slight miss when you put your foot down, even in low gears.Can anyone tell me what the "crank angle sensor" actually does, other than cause problems that is?

These issues could be from a number of things but the two most likely is the fuel itself and the CSA (crank angle sensor).

Quality and the RON (reasearch octane number) of fuel can play a huge factor here, if the fuel is of a poor qaulity or contaminated in some way burning issues will cause these type of problems. The other thing is the RON as it may well be that a cheaper quality of fuel though stated as having a RON of 93 (the min octane rating required for newer/current Petrol GW engines) may be slightly overrated which will cause missing, pining and knocking.

To test the fuel to see if it's just the octane rating not being up to the level advertised you can simply try adding a octane booster to your fuel that can be bought from most petrol stations and auto shops. If once you add a octane booster the engine runs correctly/smoothly that will indicate that the fuel was maybe of a lower octane rating than stated. If this happens you can either buy a higher grade/RON of fuel or if thats not of avail maybe continue buying and adding a suitable octane booster to bring the octane lvel up to spec.

Now the CSA (cank angle sensor) and what they do and how they affect the running of a vehicle. What a CSA does is monitor the carnk shafts position and rotational speed, this information is then sent to the ECU ( engine control unit, which is a basic computer that reads information from sensors in the vehicle and manages how a it runs and has a set program) which uses this information to control engine timing. It's what replaces and does the job of a distributor and manual timing adjustments and is needed in mordern cars which have variable timing.

The CSA is a simple device using a inductive coil and magnets to work garthing information and is pretty much the most important sensor on modern cars today.

Thanks Wayne, I've heard of the CSA causing issues before and just wondered what it did.Can you tell me where it is located and would it be advisable to carry a spare. Where I'm going to be living and using the X240 is far from a dealer, so this info will be invaluable to me.

thanks for the adviceexperiencing the same issue on my 4 week old x240. currently sitting at 1800km, so first service has been done. dealer says the car doesnt appear to have any issues, but its performance is less than smooth. i will head down to midas tomorrow and get a second opinion. seems to do it at 2700-4600rpm. i have already removed the sheet of 'wadding' on the air filter, and the little fan blade intake cover, with no change.

howdy Herman.Your symptoms are similar to ones just rectified by dealer in mine,loose plug behind dash. I would check all your plugs to do with ignition and injection ie separate spray with dwf or similar and refit. Good luck !

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